Update actions/setup-node action to v4 (mastodon#27996)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/actions/setup-javascript/action.yml

@@ -9,7 +9,7 @@ runs:
   using: 'composite'
   steps:
     - name: Set up Node.js
-      uses: actions/setup-node@v3
+      uses: actions/setup-node@v4
       with:
         node-version-file: '.nvmrc'